whats your idea of good compression/mods with motor out

from what I understand, it's not really the numbers that matter as much as how close they are to one another. They should all be within 10% or so of each other. The motor in my GT has like 70 psi on #5, 110 in another and the others are 125-150; I know it's not good and I know it needs to be fixed, but I don't have the money. It has fresh head gaskets and doesn't blow any smoke, so we'll see how long I can beat on it I have the lower intake off now to fix an oil leak, but it was running. Whether you buy the motor or not is up to you, i'm just giving you the info I have.

As far as doing anything, if you have plans to do anything to it, the best time to do it is while it's out - you obviously realize this. The typical mods, though can be done w/ it in the car (K&N, etc).

kevin2m4 said:

whats the compression of a car that has blow by. at what compression does blow by and oil burning start?

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That's a good question. My old engine had blow-by into the crank case that would push oil out the front and rear main seals and it had compression between 164-187 psi.

My only explanation would be that the ring gap was obvioulsy incorrect and that my old engine builder sucks.

I wouldnt buy a used motor unless they're willing to put the motor's mileage in writing.
If you buy a small block with under 75,000 miles on it, unless a fool owned it before you, it will run nicely.